Separating-prism system.



0. EPPENSTEIN.

SEPARATING PRISM SYSTEM.

APPLICATION FILED mwzz. 1913.

1,142,755. PatentedJune 8, 1915,

23 1 awawtm TED s'ra'rns PATENT OFFICE.

OTTO EPPENSTEIN, OF JENA, GERMANY, ASSIGNOR TO THE FIRM OF CARL ZEISS,OF JENA. GERMANY.

sn'rnnn'r'mo-rmsm SYSTEM.

To all whom, it may concern: Be it known that I, O'z'ro Errnnsmn, a

citizen of the,.Gerinail Empire, residing at.

John, German, have invented a new and tlsefiil Separa' ing-Prism System,of which the following is a specification.

- The present invention-relates to separating systems, in which twoglass bodies are in contact with-mach other with corretogether, one ofthe said bodies being re-* cesse'd at one or more places on itscontact-r sponding surfaces w'ithout being cemented merits arefrequently subjected to more or less-violent shocks, the atmosphericpressure would not be sufficient to maintain the two bodies in contactwith one another, but they *would have to bepressed together by specialfastening means, which would be accompained by the danger ofdeformations be ing caused in the glass bodies. According to.

the present invention no special fastening means are employed, the twoglass bodies being held together solely by the atmospheric pressure.This is made possible, by

- one of the bodies being formed as a thin layer, so that, on any shocktaking place, which might affect the system, the forces acting on thisbody are not sufficiently great to separate the two bodies from oneanother. In general it will be necessary to attach to that side of thethin layer, which is not in contact with the other glass body, a thirdglass body serving for the leading in and out of the rays of light. Whenthe body having the recess or recesses is at the same time the oneforming the thin layer, the recess or recesses may be allowed to extendthrough the whale thickness of the body, so that by this means it isdivided into two or more parts. Hence, in this case the possibility isgiven, instead of providing the body, which forms the thin layer, withone or more recesses, of making it up of two or more separate parts,

Specification of Letters Patent. Kppllcatioi: filed m 22, 1913. Serialin. 785,277.

Patented June 8, 1915.

so that each space between two such parts represents a recess. 7

n the annexed drawing: Figure 1 is a section through an example oftheiprism ac-. cording to the invention on line 1--1 of Fig. 2. Fig. 2is a section on line 2.2.0f Fig. -1.

Fig. 3 is a section through a. second-exam le of such a prism on line8-3 ofFig. 4. ig. 4 ice section on line 4-4 of Fig. 8.- 0 In bothexamples the glass bodiesocohtact with one another in a plane. In Fig.-1 and a glass bodyeis provided on that-one of 'its plane limitingsurfaces, in which it contacts with a thin late b, with a recess formedby a groflnd -ifi gram. amosa'wo ray pencil systems being directedtoward this contact-surface, the one fromabove and the other from below,at a suitable angle, the mixed ray pencil s stem emer g upward contains,as is in icated in Si: drawing, only those rays of the pencil systemcoming from above, which at the contact-surface have impinged on therecess, while it colitains of the pencil system coming from below onlythose rays, which have not im-Y pinged on the recess. A glass body dindi cated inFig. 1 by dotted lines, makes it possible, to direct therays coming from above toward the contact-surface at an angle ofincidence, which is sufficiently great for total reflection at therecess 0. As aconnecting means between this latter body and the late I)a yielding cement layer is employed, so that even considerable shocks,which might occur and to which the body (1 might be subjected, aredeadened by the said layer to such an extent that, when they reach the.plate 6, they are no longer strong enoughito separate the plate I) fromthe body a.

In the second example, Figs. 3 and lathe contact surface again containsonly one recess, this time in the body forming the thin layer. Therecess is in this case formed by the two small plates 15 and b, whichare in contact with the glass body a, having between them a space 0. Themixed ray pencil system emerging upward again contains of a pencilsystem, which is directed toward the contact-surface from aboveaat asuitable angle, only those rays, which have impinged at thecontact-surface on the space 0 and have been reflected at this space,while it contains of a pencil system coming from below only those rays,which have notm1- pinged on the said space. A glass body 11 indicated inFig. 3 by dotted lines is connected with the small plates band b bymeansof ayielding cement layer and serves 5 the purpose explained in thefirst example.

I claim: I

1. In a separating prism system-two glass bodies, one of which isa thinlayer, which I bodies are in contact with one another with correspondingsurfaces without being cemerited together, one of the said bodies being'recessed on its contact-surface, which recessing is adapted to causetotal reflection in the other body at the corresponding part of itscontact surface, and a third glass body, which is attached to that sideof the thin layer, which is remote from the other of the said two glassbodies.

. 2. In a separating prism system two glass bodies, one of which is athin layer, which bodies are in contact with one another withcorresponding surfaces without being cemerited together, the said thinlayer being recessed on its contact-surface, which recessing is adaptedto cause total reflection in the other body at the corresponding part ofits contact-surface, and a third glass body, which is attached tothat-side of the thin layer, which is remote from the other of the saidtwo glass bodies.

3. In a separating prism system two glass bodies, one of which is a thinlayer, which bodies are in contact with one another with correspondingsurfaces without being cemented together, the said thin plate beingrecessed on its contact-surface, which recessing is carried rightthrough the said plate, thereby dividing it into more'than one part, andis adapted to cause total reflection in the other body at thecorresponding part of its contact-surface, and a third glass body, whichis attached to that side of the thin layer, which is remote from the.

Fnrrz SAN can.

